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Eaton Gen 1 (AutoShift) Fault Code: 35 PID: SID 231 FMI: 7 Engine Control Failure

Overview:
This code indicates the AutoShift failed to receive information from the engine or the engine failed to properly respond to throttle control during a shift as commanded by the engine J- 1939 data link.

Detection:
75 seconds after key-on and throughout the operation, the System Manager constantly monitors the communication with the engine ECM. If a communication fault occurs for more than five seconds, fault code 35 is set.

Fallback:
If the fault occurs while moving, it causes a 1-speed fallback. Once vehicle has stopped, the starting gear and reverse can be engaged. If the failure occurs at system initialization, it causes an AutoSelect fallback mode.

Required Tools:
1) Basic Hand Tools
2) Hand-Held Diagnostic Tool
3) Digital Volt/Ohm Meter
4) AutoSelect/AutoShift Troubleshooting Guide
5) Data Link Tester

Possible Causes:
1) Faulty J-1939 data link
2) Faulty vehicle interface harness or connections
3) Faulty engine harness or connections
4) Excessive radio interference
5) Faulty engine ECM
6) Faulty engine fuel pump
7) Faulty system manager ECU

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